Colourful salad in just 3 mins/starter/breakfast recipe/evening snacks/Healthy snack

Corns-1cup
Onion-1cup
Cucumber-1cup
Tomato-1cup
Walnut-1/2 cup
Black pepper-1/2 tsp
Chat masala-3 tsp
Black salt-1/2 tsp
Lemon juice-1tsp